Components

Processor

USB Interface

Extension Connectors

Extension slots contain a 16-pin IO connector and 6-pin power connector. Standard form factor EMAB will have two slots, micro-EMAB will have one. Extender boards will connect to either one or two slots (two-slot boards not compatible with micro).

Slots A and B will both include 6 PWM outputs, 1 I2C, 1 UART, 4 ADC inputs. Slot A will have an additional UART and SPI. Slot B will have 2 additional ADC/DAC pins.

A third connector (for direct cable connection, not extension boards) will include additional signals and duplicates of some from A or B.

Pinouts

Main extension connectors

Pin

A

Alternate

B

Alternate

1

GND

GND

2

3.3V

3.3V

3

A0

ADC

A4

ADC

4

A1

ADC

A5

ADC

5

A2

ADC, Async

B2

ADC, DAC, Async

6

A3

ADC

B3

ADC, DAC

7

C0

PWM, SDA

E0

PWM, SDA

8

C1

PWM, SCL

E1

PWM, SCL

9

C2

PWM, RX

E2

PWM, RX

10

C3

PWM, TX

E3

PWM, TX

11

C4

PWM, SS

D0

PWM

12

C5

PWM, MOSI

D1

PWM

13

C6

RX, MISO

A6

ADC

14

C7

TX, SCK

A7

ADC

15

GND

GND

16

GND

GND

UEXT

1

3.3V

2

GND

3

C3

TX

4

C2

RX

5

C1

SCL

6

C0

SDA

7

C6

MISO

8

C5

MOSI

9

C7

SCK

10

C4

SS

Analog input

XMEGA A/D converters require a reference voltage up to Vcc-0.6V. Reference voltage onboard will be switchable between a low-current LDO and precision shunt reference (up to 2.5V). Analog reference signal will be available on extension power connector to be used (or supplied) by extension boards.